Try xobni, a fast search companion in Outlook. It also gives a quick overview of sender statistics, conversations and attachments. It works good with the offline KOC.http://www.xobni.com
Microsoft was very interested in the company, but Xobni didn't agree.

I tried them, provides a limited set of additional features to Outlook. If you need to keep business contacts categorized by relation, this tool is the one to have. Unfortunately I did find it slowed down Outlook too much for my use. Definately worth a try though.

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